<template>
	 <!-- 左侧菜单栏 -->
    <el-menu
      unique-opened
      :collapse="isCollapse"
      :default-active="$route.path"
      class="el-menu-vertical-demo"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
      router
    >
    <!--是否水平折叠收起菜单 会影响这里字段的显示 -->
    <h3 v-show="isCollapse">后台</h3>
    <h3 v-show="!isCollapse">后台管理系统</h3>
    <hr/>
      <el-menu-item 
         :index="item.path" 
         v-for="item in noChildren" 
         :key="item.path"
         @click="clickMenu(item)">
        <i :class="'el-icon-'+item.icon"></i>
        <span slot="title">{{item.label}}</span>
      </el-menu-item>
       <el-submenu 
         index="index" 
         v-for="(item,index) in hasChildren" 
         :key="index"
       >
        <template slot="title">
            <i :class="'el-icon-'+item.icon"></i>
            <span>{{item.label}}</span>
        </template>
        <el-menu-item-group>
         <el-menu-item 
              :index="subItem.path" 
              v-for="(subItem,subIndex) in item.children" 
              :key="subIndex"
              @click="clickMenu(subItem)"
            >
              {{subItem.label}}
            </el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>
</template>
<script>
    //封装的左侧导航菜单
    import navmenu from '../config/navmenu.js'
    export default{
    	 //计算属性
		  computed: {
		    //没有子菜单
		    noChildren() {
		      return this.menu.filter(item => !item.children)
		    },
		    //有子菜单 
		    hasChildren() {
		      return this.menu.filter(item => item.children)
		    },
        isCollapse() {
        // 这里的数据就是从vuex取得
          return this.$store.state.tab.isCollapse
        }
		  },
		  data(){
		  	return{
          //获取菜单栏数据并赋值给menu
		  		menu:navmenu
		  	}
		  },
		  methods:{
		  	clickMenu(item){
		  		this.$store.commit('selectMenu',item)
		  	},
		  }
    }
</script>
<style scoped>
	.el-menu{
		height: 100%;
		border: none;
	}
  .el-menu {
    height: 100%;
    border: none;
  }
  h3{
    color: #ffffff;
    text-align: center;
    line-height: 50px;
  }
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
</style>